High Temperature In-Situ X-Ray Analysis of a Lean Duplex Stainless Steel

• Published in: Proceedings of the 3rd Pan American Materials Congress pp. 289 - 295
• Main Authors: da Cunha Rocha, Adriana, da Rocha Santos, Andrea Pedroza, Pereira, Gabriela Ribeiro
• Format: Book Chapter
• Language: English
• Published: Cham Springer International Publishing
• Series: The Minerals, Metals & Materials Series
• Subjects: Duplex stainless steel; In-Situ X-ray diffraction; Rietveld method; Sigma phase
• DOI: 10.1007/978-3-319-52132-9_28
• ISBN: 9783319521312; 3319521314
• ISSN: 2367-1181

Duplex Steels have been used for different applications in the oil and gas industry due to their high strength and corrosion resistance. In this work, a Lean Duplex Steel (UNS S32304) has been investigated by High Temperature In-Situ X-Ray DiffractionIn-Situ X-ray diffraction, in order to address phases transformations occurring during high-temperature real time exposure and the formation of deleterious phases such as sigma phaseSigma phase. Samples were subjected to a temperature of 800 °C for different time intervals (30 and 60 min) inside a high temperature furnace attached to an x-ray diffractometer. Formation of sigma phase was observed, both in the ferrite grain boundaries and in the ferrite/austenite interface. The volume of sigma phase was measured by quantitative phase analysis using the Rietveld methodRietveld method and results varied from 2.80 to 15.92% in volume.